1 /* 2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Format and print ntp packets. 22 * By Jeffrey Mogul/DECWRL 23 * loosely based on print-bootp.c 24 * 25 * $FreeBSD$ 26 */ 27 28 #ifndef lint 29 static const char rcsid[] = 30 "@(#) $Header: /tcpdump/master/tcpdump/print-ntp.c,v 1.32.4.1 2002/07/10 07:13:37 guy Exp $ (LBL)"; 31 #endif 32 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #include <sys/param.h> 38 #include <sys/time.h> 39 #include <sys/socket.h> 40 41 #include <netinet/in.h> 42 43 #include <ctype.h> 44 #include <stdio.h> 45 #include <string.h> 46 47 #include "interface.h" 48 #include "addrtoname.h" 49 #ifdef MODEMASK 50 #undef MODEMASK /* Solaris sucks */ 51 #endif 52 #include "ntp.h" 53 54 static void p_sfix(const struct s_fixedpt *); 55 static void p_ntp_time(const struct l_fixedpt *); 56 static void p_ntp_delta(const struct l_fixedpt *, const struct l_fixedpt *); 57 58 /* 59 * Print ntp requests 60 */ 61 void 62 ntp_print(register const u_char *cp, u_int length) 63 { 64 register const struct ntpdata *bp; 65 int mode, version, leapind; 66 67 bp = (struct ntpdata *)cp; 68 /* Note funny sized packets */ 69 if (length != sizeof(struct ntpdata)) 70 (void)printf(" [len=%d]", length); 71 72 TCHECK(bp->status); 73 74 version = (int)(bp->status & VERSIONMASK) >> 3; 75 printf(" v%d", version); 76 77 leapind = bp->status & LEAPMASK; 78 switch (leapind) { 79 80 case NO_WARNING: 81 break; 82 83 case PLUS_SEC: 84 fputs(" +1s", stdout); 85 break; 86 87 case MINUS_SEC: 88 fputs(" -1s", stdout); 89 break; 90 } 91 92 mode = bp->status & MODEMASK; 93 switch (mode) { 94 95 case MODE_UNSPEC: /* unspecified */ 96 fputs(" unspec", stdout); 97 break; 98 99 case MODE_SYM_ACT: /* symmetric active */ 100 fputs(" sym_act", stdout); 101 break; 102 103 case MODE_SYM_PAS: /* symmetric passive */ 104 fputs(" sym_pas", stdout); 105 break; 106 107 case MODE_CLIENT: /* client */ 108 fputs(" client", stdout); 109 break; 110 111 case MODE_SERVER: /* server */ 112 fputs(" server", stdout); 113 break; 114 115 case MODE_BROADCAST: /* broadcast */ 116 fputs(" bcast", stdout); 117 break; 118 119 case MODE_RES1: /* reserved */ 120 fputs(" res1", stdout); 121 break; 122 123 case MODE_RES2: /* reserved */ 124 fputs(" res2", stdout); 125 break; 126 127 } 128 129 TCHECK(bp->stratum); 130 printf(" strat %d", bp->stratum); 131 132 TCHECK(bp->ppoll); 133 printf(" poll %d", bp->ppoll); 134 135 /* Can't TCHECK bp->precision bitfield so bp->distance + 0 instead */ 136 TCHECK2(bp->distance, 0); 137 printf(" prec %d", bp->precision); 138 139 if (!vflag) 140 return; 141 142 TCHECK(bp->distance); 143 fputs(" dist ", stdout); 144 p_sfix(&bp->distance); 145 146 TCHECK(bp->dispersion); 147 fputs(" disp ", stdout); 148 p_sfix(&bp->dispersion); 149 150 TCHECK(bp->refid); 151 fputs(" ref ", stdout); 152 /* Interpretation depends on stratum */ 153 switch (bp->stratum) { 154 155 case UNSPECIFIED: 156 printf("(unspec)"); 157 break; 158 159 case PRIM_REF: 160 fn_printn((u_char *)&(bp->refid), 4, NULL); 161 break; 162 163 case INFO_QUERY: 164 printf("%s INFO_QUERY", ipaddr_string(&(bp->refid))); 165 /* this doesn't have more content */ 166 return; 167 168 case INFO_REPLY: 169 printf("%s INFO_REPLY", ipaddr_string(&(bp->refid))); 170 /* this is too complex to be worth printing */ 171 return; 172 173 default: 174 printf("%s", ipaddr_string(&(bp->refid))); 175 break; 176 } 177 178 TCHECK(bp->reftime); 179 putchar('@'); 180 p_ntp_time(&(bp->reftime)); 181 182 TCHECK(bp->org); 183 fputs(" orig ", stdout); 184 p_ntp_time(&(bp->org)); 185 186 TCHECK(bp->rec); 187 fputs(" rec ", stdout); 188 p_ntp_delta(&(bp->org), &(bp->rec)); 189 190 TCHECK(bp->xmt); 191 fputs(" xmt ", stdout); 192 p_ntp_delta(&(bp->org), &(bp->xmt)); 193 194 return; 195 196 trunc: 197 fputs(" [|ntp]", stdout); 198 } 199 200 static void 201 p_sfix(register const struct s_fixedpt *sfp) 202 { 203 register int i; 204 register int f; 205 register float ff; 206 207 i = ntohs(sfp->int_part); 208 f = ntohs(sfp->fraction); 209 ff = f / 65536.0; /* shift radix point by 16 bits */ 210 f = ff * 1000000.0; /* Treat fraction as parts per million */ 211 printf("%d.%06d", i, f); 212 } 213 214 #define FMAXINT (4294967296.0) /* floating point rep. of MAXINT */ 215 216 static void 217 p_ntp_time(register const struct l_fixedpt *lfp) 218 { 219 register int32_t i; 220 register u_int32_t uf; 221 register u_int32_t f; 222 register float ff; 223 224 i = ntohl(lfp->int_part); 225 uf = ntohl(lfp->fraction); 226 ff = uf; 227 if (ff < 0.0) /* some compilers are buggy */ 228 ff += FMAXINT; 229 ff = ff / FMAXINT; /* shift radix point by 32 bits */ 230 f = ff * 1000000000.0; /* treat fraction as parts per billion */ 231 printf("%u.%09d", i, f); 232 } 233 234 /* Prints time difference between *lfp and *olfp */ 235 static void 236 p_ntp_delta(register const struct l_fixedpt *olfp, 237 register const struct l_fixedpt *lfp) 238 { 239 register int32_t i; 240 register u_int32_t uf; 241 register u_int32_t ouf; 242 register u_int32_t f; 243 register float ff; 244 int signbit; 245 246 i = ntohl(lfp->int_part) - ntohl(olfp->int_part); 247 248 uf = ntohl(lfp->fraction); 249 ouf = ntohl(olfp->fraction); 250 251 if (i > 0) { /* new is definitely greater than old */ 252 signbit = 0; 253 f = uf - ouf; 254 if (ouf > uf) /* must borrow from high-order bits */ 255 i -= 1; 256 } else if (i < 0) { /* new is definitely less than old */ 257 signbit = 1; 258 f = ouf - uf; 259 if (uf > ouf) /* must carry into the high-order bits */ 260 i += 1; 261 i = -i; 262 } else { /* int_part is zero */ 263 if (uf > ouf) { 264 signbit = 0; 265 f = uf - ouf; 266 } else { 267 signbit = 1; 268 f = ouf - uf; 269 } 270 } 271 272 ff = f; 273 if (ff < 0.0) /* some compilers are buggy */ 274 ff += FMAXINT; 275 ff = ff / FMAXINT; /* shift radix point by 32 bits */ 276 f = ff * 1000000000.0; /* treat fraction as parts per billion */ 277 if (signbit) 278 putchar('-'); 279 else 280 putchar('+'); 281 printf("%d.%09d", i, f); 282 } 283